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United States Patent | 6,260,959 |
Takahashi | July 17, 2001 |
An ink ejector includes an ink jet head. The head has ink channels each defined between a pair of actuator walls. The head also has nozzles each communicating with one of the channels. The ejector can eject ink from each of the channels through the associated nozzle by driving the associated walls to increase the volume of the channel once and decrease it subsequently. The walls can be driven by a first ejection pulse and a second ejection pulse of voltage applied to them. The first pulse precedes the second. The first pulse has a width between 0.5T and 1.5T where T is the one-way propagation time during which a pressure wave is propagated one way in the channel. The interval between the first and second pulses is at least 0.3T. The second pulse has a width which is at least 0.3T. The sum of the interval and the width of the second pulse ranges between 1.3T and 1.7T. These settings make it possible to form a clear image on a recording medium without spattering ink or ejecting ink in a wrong direction even at a high temperature.
Inventors: | Takahashi; Yoshikazu (Nagoya, JP) |
Assignee: | Brother Kogyo Kabushiki Kaisha (Nagoya, JP) |
Appl. No.: | 313993 |
Filed: | May 19, 1999 |
May 20, 1998[JP] | 10-138884 | |
May 20, 1998[JP] | 10-138885 |
Current U.S. Class: | 347/68; 347/10; 347/11 |
Intern'l Class: | B41J 002/045; B41J 029/38 |
Field of Search: | 247/68,9,10,11,57 358/1.8 |
4879568 | Nov., 1989 | Bartky et al. | 347/69. |
4887100 | Dec., 1989 | Michaelis et al. | 347/69. |
4992808 | Feb., 1991 | Bartky et al. | 347/69. |
5003679 | Apr., 1991 | Bartky et al. | 29/25. |
5028936 | Jul., 1991 | Bartky et al. | 347/69. |
6099103 | Aug., 2000 | Takahashi | 347/11. |
6109716 | Aug., 2000 | Takahashi | 347/11. |
6141113 | Oct., 2000 | Takahashi | 358/1. |
Foreign Patent Documents | |||
63-247051 | Oct., 1988 | JP. |